XD法制备TiC_P/Zn-Al复合材料TiC_P均匀化过程

UNIFORMIZATION PROCESS OF TiC_P IN TiC_P/Zn-Al COMPOSITE PREFABRICATED BY XD PROCESS

利用XDTM法制备高颗粒含量的TiC/Al预制合金。采用自制的实验装置研究分析了TiC/Al预制合金块中的TiC颗粒在静止锌液中的均匀化过程,建立了TiC颗粒在锌液中均匀化过程的模型。结果表明:锌液温度低于铝熔点时,TiC/Al预制合金块置于锌液后,锌向TiC/Al合金中扩散,在预制合金表层内形成Zn的扩散层,随着TiC/Al合金块中锌浓度的逐渐增大,其液相线温度降低。当预制合金表层的液相线温度等于或低于锌液温度时,便处于熔融状态,使TiC颗粒从TiC/Al合金块上脱落。脱落下来的TiC颗粒不断地向锌液内部传输,最终将均匀分布在锌液中。

The TiC/Al alloy with high TiC particle content was prepared by XDTM process. The uniformization process of TiC particles in the stable zinc melt was studied and analyzed using a self-made experimental equipment, and a model of the uniformization process was built. The results show that zinc diffuses into TiC/Al alloy placed in the zinc melt at temperatures below the melting point of aluminum, forming a zinc diffusing layer on the surface of prepared TiC/Al alloy. With the increase of the zinc concentration of in the alloy, the liquidus temperature decreases, and when the temperature is equal to or below the temperature of zinc melt, the surface of the prepared TiC/Al alloy will melt and TiC particles will drop from it, then transfer into the zinc melt, and finally distribute uniformly in the zinc melt.